JPH023850B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an anchor rod used in civil engineering works such as construction and reinforcement of buildings or retaining walls.

(Prior art) We have filed a patent application as an anchor rod in 1982.
69986 (Special Publication No. 62-62207).

The structure of this invention is as follows: ``The peripheral wall of the anchor rod body made of a cylindrical body is provided with a roughly U-shaped cut with the base facing toward the rear end of the anchor rod body, and a roughly U-shaped cut with the base facing toward the tip of the anchor rod body. In addition to providing a letter-shaped cut and a substantially linear cut,
An anchor rod characterized in that a closing fitting is attached to the opening at the tip of the anchor rod body so that an expansion agent can be injected and accommodated from the opening at the rear end of the anchor rod body. ”.

(Problems to be Solved by the Invention) When the anchor rod according to the present invention is cast or buried in the ground, earth, sand and water enter the anchor rod body through each cut, and the swelling agent injected and filled into the anchor rod body expands. There were some problems that seemed to be hindering the effectiveness.

(Means for Solving the Problems) The anchor rod of the present invention has a plurality of cuts in the peripheral wall of the anchor rod body made of a cylindrical body, which form a substantially U-shape when the anchor rod body stands upright, and a substantially inverted U-shape. Make multiple cuts,
A closure fitting is attached to the opening at the tip of the anchor rod body, and a heat-shrinkable tube is externally fitted and fixed to the peripheral wall of the anchor rod body to form the above-mentioned cuts (approximately U-shaped and approximately inverted U-shaped cuts) in the peripheral wall. The structure is such that an expansion agent can be injected and filled from the opening at the rear end of the anchor rod body.

(Function) A heat-shrinkable tube is attached to the peripheral wall of the anchor rod body to close each cut (slits that are approximately U-shaped when the anchor rod body is upright, and cuts that are approximately inverted U-shaped) provided on the peripheral wall of the anchor rod body. It is fixed externally.

An expansion agent is injected and filled into the anchor rod body thus formed to form an enlarged portion and tongues opening upward and downward to increase pull-out resistance, supporting force, and frictional force. There is no dirt or water inside the anchor rod body, so it has good expansion efficiency.

(Example) Examples of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is an exploded overall perspective view showing one embodiment of the present invention. In the figure, reference numeral 1 denotes an anchor rod body made of a cylindrical body made of metal or synthetic resin. The peripheral wall of the anchor rod body 1 has a plurality of cuts 3 that form a substantially inverted U-shape when the anchor rod main body 1 stands upright, and a plurality of cuts 2 that form a substantially U-shape when the anchor rod main body 1 is stood upright.
and is provided. The cuts 3 form a plurality of tongue pieces 5 that open upward, and the cuts 2 form a plurality of tongue pieces 4 that open downward. FIG. 2 is a cross-sectional view taken along the line X--X of FIG. 1.

On the other hand, 6 in FIG. 1 is a closing fitting, and the rear end 6
b is press-fitted and fixed into the tip opening 1a of the anchor rod body 1. By attaching the closing fitting 6 to the anchor rod body 1, soil is prevented from entering the anchor rod body 1 underground, and a storage chamber is created in which the expansion agent can be injected and filled from the rear end opening 1b of the anchor rod body 1. is formed. Note that the attachment of the closing fitting 6 to the tip opening 1a of the anchor rod main body 1 is not limited to that shown here. The closure fitting 6 is mainly used for driving, and the tip 6a has a sharp shape. 7 is a heat-shrinkable tube, and the anchor rod body 1
The anchor rod is externally fitted and fixed to the peripheral wall portion of the anchor rod body 1 so as to close each cut 2..., 3... provided in the anchor rod body 1. By fitting and fixing the heat-shrinkable tube 7 to the anchor rod main body 1 in this way, each cut 2...,
3. It is possible to prevent dirt and water from entering the anchor rod body 1 from... In this way, the anchor rod A is composed of the anchor rod body 1, the closure fitting 6, and the heat-shrinkable tube 7.

In addition, when driving the anchor rod body 1 into the ground, the temperature of the heat-shrinkable tube 7 is approximately 70°C to 100°C.
The anchor rod is heated by pouring boiling water on it to cause it to shrink, and is then fitted and fixed onto the peripheral wall of the anchor rod body 1, and the cuts described above are closed.

As explained above, in the above embodiment,
Cuts 3, which form a substantially inverted U-shape when the anchor rod main body 1 is stood upright, and cuts 2, which form a substantially U-shape when the anchor rod main body 1 is stood upright are provided on the peripheral wall of the anchor rod body 1, and a closing fitting 6 is attached to the tip opening 1a. Since it is constructed by simply fitting and fixing the heat-shrinkable tube 7 that closes each incision onto the peripheral wall of the anchor rod body 1, manufacturing is extremely easy and therefore inexpensive. Further, since the heat-shrinkable tube 7 is externally fitted and fixed, it is possible to completely prevent dirt and water from entering into the anchor rod body 1 from the cuts 2, 3, etc. in the ground. It can be effectively applied to soil formed from sediment with small particle size, as well as to soft soil with a high moisture content. Then, after pouring or burying it on site, the anchor rod body 1
If the swelling agent 11 is injected from the rear end opening 1b,
Due to the expansion pressure, the tongues 4..., 5... stand up to open upwardly and downwardly, and the pull-out resistance and supporting force of the anchor rod A in the ground are significantly increased. Furthermore, as will be explained in detail below, it is only necessary to make cuts 2..., 3... in the peripheral wall of the anchor rod body 1 at the factory and then pour the holes at the site. Since it is only necessary to drill holes with approximately the same diameter, reinforcement work such as retaining walls can be done quickly and economically.

In the above embodiment, the anchor rod body 1 is made of a cylindrical body, but a hollow prismatic body may also be adopted. Further, the substantially U-shaped or substantially inverted U-shaped cut may also be, for example, a U-shape, a V-shape, a semicircle, or the like. Furthermore, the cuts 2..., 3... may be provided alternately along the circumference of the anchor rod body 1, or may be provided alternately along the axial direction. may be provided substantially on the same line along the axial direction. It is preferable that the number of each of these cuts is as large as possible as long as it does not significantly affect the strength of the anchor rod body, but it is preferable to make them as close to the tip of the anchor rod body as possible, and it is sufficient to make them at about 3 places on the same circumference of the surrounding wall. It is.

Further, in the above embodiment, the anchor rod body 1 and the closure fitting 6 are separate members, but they may be formed integrally, or the tip opening 1a of the anchor rod body 1 and the rear end 6b of the closure fitting 6 may be formed integrally. It is also possible to have male and female screws. For embedding, a closing metal fitting with a flat tip as shown in FIG. 3 may be used.

Further, in the above embodiment, the heat-shrinkable tube 7 is made of vinyl chloride resin, but it may be made of nylon resin, polyester resin, polypropylene resin, or the like. However, chemical resistance,
In terms of water resistance, weather resistance, and physical strength, those made of vinyl chloride resin are preferred. For example, "Kopalon S-Tube" manufactured by Gunkore Koubun Kogyo Co., Ltd.
(Product name) is preferably used. The heat-shrinkable tube 7 is open at both ends, but the tip may be bottomed, especially if it is to be buried. The anchor rod body 1 may also be coated.

Hereinafter, by explaining an example of a method of reinforcing the retaining wall 8 that can be carried out by employing the anchor rod A of the above embodiment, the function of the anchor rod A of the present invention,
The effects will be explained in more detail.

First, the heat-shrinkable tube 7 is poured with boiling water at about 80° C. to cause the heat-shrinkable tube 7 to be fitted and fixed onto the peripheral wall of the anchor rod body 1, and each cut is closed. Next, as shown in FIG. 4, a plurality of anchor rods A are inserted into the ground 10 at an acute angle to the vertical axis of the retaining wall 8 through holes 9 drilled at predetermined intervals in the retaining wall 8. Hit it deep. It is preferable that the anchor rod A is relatively short when driven into the upper part of the retaining wall 8, and becomes gradually longer towards the lower part. However, the method is not necessarily limited to this, and long anchor rods and short anchor rods may be driven alternately.
Furthermore, if the ground is soft, it is preferable to use a long anchor rod. In this way, even if the anchor rod A is driven into the ground 10, the heat-shrinkable tube 7 prevents earth, sand and moisture from entering the anchor rod body 1.

Each anchor rod A driven in this way...
The swelling agent 11 is applied from the rear end opening 1b to each cut 2...,
3. Inject and fill up to the position where... is provided. This swelling agent is a mixture of an inorganic compound mainly composed of silicate, a specific organic compound, and water. For example, a mixture of "Blystar" (trade name) manufactured by Onoda Cement Co., Ltd. and water can be suitably used. Note that a mixture of this expanding agent with a small amount of cement, mortar, etc. may also be used.

The injected expansion agent 11 hardens enormously and reaches its maximum expansion pressure after about 12 to 24 hours, and as shown in FIG. 5, due to this expansion pressure, the tongue pieces 4..., 5... is broken and stands up to open upward and downward (bulbar portion 11...). Pull-out resistance and supporting force are imparted to the anchor rod A by the standing up of the tongue pieces 5 that open upward and the tongue pieces 4 that open downward. FIG. 6 is a partial perspective view of the anchor rod A showing the state in which the tongue pieces 4..., 5... are opened upwardly and downwardly, with the broken heat-shrinkable tube 7 omitted; FIG. FIG. 7 is a cross-sectional view taken along the Y-Y line in FIG. 6, with portions omitted.

As the tongues 4..., 5... of the anchor rod main body 1 rise, the surrounding parts of the anchor rod main body 1 expand (the enlarged parts 12...), and compressive stress is applied to the soil layer around those parts of the anchor rod A, resulting in consolidation. arise. As a result, anchor rod A and underground 10
A large frictional force is generated between anchor rod A...
The pull-out resistance of is very high.

After the expansion of the expansion agent 11 is completed, a closing fitting is attached to the upper end opening of each anchor rod A protruding from the retaining wall 8, and each anchor rod A engaged with the retaining wall 8 is tightened using a fastening means such as a nut. Grant. By applying tension in this manner, the pull-out resistance and supporting force of the anchor rods A become larger.

As described above, the reinforcement of the retaining wall employing the above embodiment of the anchor rod of the present invention is completed.

In addition, if the rear end of each anchor rod A is undesirably exposed from the retaining wall 8, it is preferable to bury that part with concrete.

(Effect of the invention) An expansion agent is injected and filled into the anchor rod body driven into the ground to form an enlarged portion and a tongue piece that opens up and down on the peripheral wall of the anchor rod body, thereby increasing the anchor rod's pull-out resistance and supporting force. Frictional force can be increased. A heat-shrinkable tube that closes each incision is fitted onto the peripheral wall of the anchor rod body, which prevents dirt and water from entering the anchor rod body and inhibiting the expansion efficiency of the expansion agent. The construction is easy and does not require a large number of construction machines, as it is only necessary to cast or bury the straight tubular anchor rod body in the ground and inject and fill it with an expanding agent. The anchor rod body can be mass-produced in a factory, and it is economical because it is easy to construct, and it can be constructed easily and quickly with little noise even in areas where houses and facilities are crowded.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention;
Fig. 2 is a cross-sectional view taken along the line X-X of Fig. 1, Fig. 3 is a perspective view showing another embodiment of the closure fitting, and Fig. 4 shows an anchor rod of the present invention penetrating a hole provided in a retaining wall. Figure 5 is a partial cross-sectional view showing the state in which the tongue piece has broken the heat-shrinkable tube and stood up in the ground. Figure 6 is a partial cross-sectional view showing the tongue piece being driven into the ground. Fig. 7 is a perspective view of the main parts of the heat-shrinkable tube in a state in which it is erected and its peripheral portion is expanded, with the heat-shrinkable tube omitted; be. A... Anchor rod, 1... Anchor rod body, 2, 3... Cut, 4, 5... Tongue piece, 6...
Closing fitting, 7... Heat-shrinkable tube, 8... Retaining wall, 10... Underground, 11... Expansion agent, 12... Ampulla.

Claims (1)

[Claims] 1 A plurality of cuts that form a substantially U-shape when the anchor rod body is stood upright, and a plurality of cuts that form a substantially inverted U-shape are provided in the peripheral wall portion of the anchor rod body consisting of a cylindrical body, and the opening at the tip of the anchor rod body is formed. Attach a closing fitting to the anchor rod body, fit and secure a heat-shrinkable tube to the peripheral wall of the anchor rod body, close the above-mentioned cuts (approximately U-shaped and approximately inverted U-shaped cuts) formed in this peripheral wall, and What is claimed is: 1. An anchor rod characterized in that it is configured such that an expansion agent can be injected and filled from a rear end opening of the anchor rod main body.